Three fourth of the active decays in a radioactive sample in `3//4 sec`. The half-life of the sample is

Three fourths of the active nuclei present in a radioactive sample decay in 3//4s . The half life of the sample is

Three fourthers of the active nuclei present in a redioactive sample decay in 3/4s. The half life of the sample is

7/8th of the active nuclei present in a radioactive sample has decayed in 8 s. The half-life of the sample is

7/8th of the active nuclei present in a radioactive sample has decayed in 8 s. The half-life of the sample is

State the law of radioactive decay. 3/4th of a radioactive sample decays in 3/4 s. What is the half-life of the sample?

The decay constant of a radioactive sample is lambda . The half-life and mean life of the sample respectively are